On Thu, 26 Jul 2012 08:22:37 -0700 (PDT), you wrote: >I'm looking for a commercial source for very small batteries...needing 3V = so stacked is fine.=A0 Load is essentially a LED, but size needs to be as s= mall as possible..trying to get dimensions from the client but havent heard= back yet.=A0 The smallest I can imagine are hearing aid types...but anythi= ng else thats commercially available?=A0 Does not have to be rechargeable, = in fact better that they are not. there are some pretty small alkaline & silver oxide watch button cells - pr= obably not much difference in volume whether 2 cells are smaller than one plus a booster Battery size list :=20 http://www.watch-batteries.com/silver_oxide_battery_reference_chart.htm I've also seen some very slim cylindrical lithiums, if diameter is the main= issue --=20 http://www.piclist.com PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist .